Tapping attachment for drill-presses



2 Sheets-Sheet 1.

(No Model.)

G. WOODWORTH, TAPPING ATTACHMENT FOR DRILL PRESSES. No. 541,029.

R 0 T N E V N 'iTll Pategted June 11,1895.

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(No Model.)

G. WOO-DWORTI-I. TAPPING ATTACHMENT FOR DRILL PRESSES.

THE ncmms PETIRS ca. moro-umu wasnms'r UNITE STATES 'ATENT OFFI E;

GEORGE VVOODWORTH, OF BROOKLYN, NEW YORK.

TAPPING ATTACHMENT FOR DRlLL- PRESSES.

SPECIFICATION forming part of Letters Patent No. 541,029, dated June 11,1 895.

I Application filed June 24, 1892. Serial No. 437,838- (No model.)

' i To all whom it may concern: 7

' ments for Drill-Presses, of ing is a specification.

Be it known that I, GEORGE Woopwonrn, a citizen of the United States,and a resident of Brooklyn, in the county of Kings and State.

of New York, have invented certain new and useful Improvements inTapping Attachwhich the fol low- My invention consists of a tappingspindle mounted in an improved, simple and efficient construction andarrangement of apparatus, in suitable'relation t the drilling spindlefor bringing the holes drilled into position for receiving the tapwithout shifting the work on the table, all as hereinafter fullydescribed, reference being made to the accompanying drawings, in whichFigure 1 is a horizontal section of a drillpress having my improvedattachment on line at :0, Fig. 2. Fig. 2 is partly a side elevation andpartly a sectional elevation. Fig. 3 is a horizontal section on line yy, Fig. 2. Fig. 4 is a horizontal section of parts on line to to, Figs.2 and 5. Fig. 5 is an elevation of part of the drill, with the tappingattachment in section, on line 2 z, Figs. land 3.

On the arm a, of the standard b,'supporting the drill spindle c, ofusual form and arrangement, I have provided the laterally projectingbracket d, in the outer extremity of which is v mounted a verticalcounter shaft e, parallel and so as to swing on the axis of shaft e;

At the upper side of the swinging bracket h, the tapping spindle hasaloosewheel j, geared with another wheel is, keyed on the counter shaft6, and at the lower side of said bracket 71. the tapping spindle hasanother loose wheel Z, geared with shaft e, through the intermediatewheels m, and the wheel 12 on said shaft 6. Wheels and Z have clutchhubs j and-Z, respectively with which the clutch 0, splined or featherkeyed on the drill mandrel engages to drive the spindle forward forinserting the tap, or backward for withdrawing it according as saidclutch is engagedwith wheelj, or Z, by the shifting lever 19.

, The tap spindle is adapted to slide up and down in the wheels j and Z,and clutch 0, as usual in such devices and it is provided with thecoiled spring q, to hold it up in the normal position said spring beingapplied on the spindle between the hub of the hand wheels, at the upperend of the spindle and the plate t, employed for the spring to rest onand also as a guard to prevent wheel j from rising along with thespindle when it moves upward, said plate having its support on the endof the swinging bracket h, and its lower extremity 15, extends underwheel Z, to hold it in its Working position. The wheelsj and Z mayhowever be held in position by means of collars on the inner ends of theclutch hubs or other approved means.

v The gear train Z, m, and n, for withdrawing the tap from the work isadjusted for higher speed of the tap spindle than the train j, k, forentering-the tap as is usual in such cases.

I have provided an adjustable automatic tripping device for unolutchingand stopping the tapping spindle which consists of the extensiblesliding rod u, fixed in an upright support under the hand wheel comingin contact with the upper end of said rod when the tap has nearlyentered to the desired depth in the Work and then force said roddownward. The extensible roduis connected at its lower end with one endof the rock lever 12, pivoted at its center and connected at its otherend with the clutch lever 19, by the rod w, so that the downwardmovement of rod 11 shifts clutch 0, out of connection with the hub ofwheel j, and into connection with the hub of wheel Z, to reverse the tapand withdraw it from the work automatically.

The standard 00 supports the wheel g, on the drill spindle'c, which hasto slide up and down in said wheel. Wheel 9 may be shifted upward andsupported out of gear with wheel f, as indicated in dotted lines, inFigs. 2 and 5, when the machine is to be used for drilling only.

It will be seen that holes drilled in the work supported on the table y,may be brought under the tap suitably for being entered by the rr I tap,without shifting the work on the table, this being accomplished byswinging table g, on the standard I), and swinging the tapping spindleon the pivot e, to the point where the paths of the hole and the tapcross as indicated by the dotted lines 2 and 3.

When the tap is to be entered the attendant clutches the tap spindlewith the driving train and then with the hand Wheel 3, presses thespindle down until the tap enters, and when the tap is withdrawn fromthe work by the reverse motion the spring again shifts the spindle tothe normal position.

To secure the tapping spindle in position while at work a curved bar ais attached to the swinging bracket h, and a set screw 0 having a handled is fitted in the base plate I) of the standard w so as to be screwedagainst the bar arranged under said base and thus secure it in a wayenabling it to be secured and released readily.

I claim 1. The combination with the drill spindle located in fixedsupports, and with the swing ing work table, of the swinging tappingspindle parallel with the drill spindle, and having its pivotal centereccentric to that of the table, said tapping spindle having suitabledirect and reverse driving gear substantially as described.

2. The combination with the drill spindle, and with the swinging worktable, of the tapping spindle parallel with the drill spindle, theswinging frame pivoted on the bracket of the spindle supporting arm, thecounter shaft in the axis of the tapping spindle supporting frame, andthe gears connecting the drill spindle and tapping spindle substantiallyas described.

Signed at New York, in the county of New York and State of New York,this 26th day of March, A. I). 1892.

GEORGE WOODWORTII.

\Vitnesses:

W. J. MORGAN, W. 13. EARLL.

